diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 2 | ||||
| -rw-r--r-- | kernel/fork.c | 2 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 3 | ||||
| -rw-r--r-- | kernel/kprobes.c | 20 | ||||
| -rw-r--r-- | kernel/pid.c | 2 | ||||
| -rw-r--r-- | kernel/profile.c | 3 | ||||
| -rw-r--r-- | kernel/sys.c | 15 |
7 files changed, 32 insertions, 15 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 3540172..fec12eb 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -938,8 +938,8 @@ fastcall NORET_TYPE void do_exit(long code) tsk->exit_code = code; proc_exit_connector(tsk); - exit_notify(tsk); exit_task_namespaces(tsk); + exit_notify(tsk); #ifdef CONFIG_NUMA mpol_free(tsk->mempolicy); tsk->mempolicy = NULL; diff --git a/kernel/fork.c b/kernel/fork.c index fc723e5..d57118d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1313,7 +1313,7 @@ noinline struct pt_regs * __devinit __attribute__((weak)) idle_regs(struct pt_re return regs; } -struct task_struct * __devinit fork_idle(int cpu) +struct task_struct * __cpuinit fork_idle(int cpu) { struct task_struct *task; struct pt_regs regs; diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index b385878..8b961ad 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -315,6 +315,9 @@ int setup_irq(unsigned int irq, struct irqaction *new) /* Undo nested disables: */ desc->depth = 1; } + /* Reset broken irq detection when installing new handler */ + desc->irq_count = 0; + desc->irqs_unhandled = 0; spin_unlock_irqrestore(&desc->lock, flags); new->irq = irq; diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 17ec4af..6fcf8dd 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -87,6 +87,12 @@ struct kprobe_insn_page { int ngarbage; }; +enum kprobe_slot_state { + SLOT_CLEAN = 0, + SLOT_DIRTY = 1, + SLOT_USED = 2, +}; + static struct hlist_head kprobe_insn_pages; static int kprobe_garbage_slots; static int collect_garbage_slots(void); @@ -130,8 +136,8 @@ kprobe_opcode_t __kprobes *get_insn_slot(void) if (kip->nused < INSNS_PER_PAGE) { int i; for (i = 0; i < INSNS_PER_PAGE; i++) { - if (!kip->slot_used[i]) { - kip->slot_used[i] = 1; + if (kip->slot_used[i] == SLOT_CLEAN) { + kip->slot_used[i] = SLOT_USED; kip->nused++; return kip->insns + (i * MAX_INSN_SIZE); } @@ -163,8 +169,8 @@ kprobe_opcode_t __kprobes *get_insn_slot(void) } INIT_HLIST_NODE(&kip->hlist); hlist_add_head(&kip->hlist, &kprobe_insn_pages); - memset(kip->slot_used, 0, INSNS_PER_PAGE); - kip->slot_used[0] = 1; + memset(kip->slot_used, SLOT_CLEAN, INSNS_PER_PAGE); + kip->slot_used[0] = SLOT_USED; kip->nused = 1; kip->ngarbage = 0; return kip->insns; @@ -173,7 +179,7 @@ kprobe_opcode_t __kprobes *get_insn_slot(void) /* Return 1 if all garbages are collected, otherwise 0. */ static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx) { - kip->slot_used[idx] = 0; + kip->slot_used[idx] = SLOT_CLEAN; kip->nused--; if (kip->nused == 0) { /* @@ -212,7 +218,7 @@ static int __kprobes collect_garbage_slots(void) continue; kip->ngarbage = 0; /* we will collect all garbages */ for (i = 0; i < INSNS_PER_PAGE; i++) { - if (kip->slot_used[i] == -1 && + if (kip->slot_used[i] == SLOT_DIRTY && collect_one_slot(kip, i)) break; } @@ -232,7 +238,7 @@ void __kprobes free_insn_slot(kprobe_opcode_t * slot, int dirty) slot < kip->insns + (INSNS_PER_PAGE * MAX_INSN_SIZE)) { int i = (slot - kip->insns) / MAX_INSN_SIZE; if (dirty) { - kip->slot_used[i] = -1; + kip->slot_used[i] = SLOT_DIRTY; kip->ngarbage++; } else { collect_one_slot(kip, i); diff --git a/kernel/pid.c b/kernel/pid.c index 2efe9d8..78f2aee 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -197,7 +197,7 @@ fastcall void free_pid(struct pid *pid) hlist_del_rcu(&pid->pid_chain); spin_unlock_irqrestore(&pidmap_lock, flags); - free_pidmap(current->nsproxy->pid_ns, pid->nr); + free_pidmap(&init_pid_ns, pid->nr); call_rcu(&pid->rcu, delayed_put_pid); } diff --git a/kernel/profile.c b/kernel/profile.c index a6574a1..d6579d5 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -331,7 +331,6 @@ out: local_irq_restore(flags); put_cpu(); } -EXPORT_SYMBOL_GPL(profile_hits); static int __devinit profile_cpu_callback(struct notifier_block *info, unsigned long action, void *__cpu) @@ -401,6 +400,8 @@ void profile_hits(int type, void *__pc, unsigned int nr_hits) } #endif /* !CONFIG_SMP */ +EXPORT_SYMBOL_GPL(profile_hits); + void profile_tick(int type) { struct pt_regs *regs = get_irq_regs(); diff --git a/kernel/sys.c b/kernel/sys.c index c7675c1..6e2101d 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -323,11 +323,18 @@ EXPORT_SYMBOL_GPL(blocking_notifier_chain_unregister); int blocking_notifier_call_chain(struct blocking_notifier_head *nh, unsigned long val, void *v) { - int ret; + int ret = NOTIFY_DONE; - down_read(&nh->rwsem); - ret = notifier_call_chain(&nh->head, val, v); - up_read(&nh->rwsem); + /* + * We check the head outside the lock, but if this access is + * racy then it does not matter what the result of the test + * is, we re-check the list after having taken the lock anyway: + */ + if (rcu_dereference(nh->head)) { + down_read(&nh->rwsem); + ret = notifier_call_chain(&nh->head, val, v); + up_read(&nh->rwsem); + } return ret; } |
